687ec91379
We can just simplify the usage of an sqlalchemy if we just use (we already have our own ORM like objects anyway) sqlalchemy core in the first place and have a very tiny layer that converts back and forth from our very limited object model that we use in our persistence layer. This change makes that adjustment, which makes it easier to read and understand the actions the sqlalchemy backend is doing when saving, reading and updating data, and avoids yet another layer that isn't useful for our purposes anyway. Change-Id: I911c509f65e7845aee86fed1622eaa56970741f2
100 lines
4.3 KiB
Python
100 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import collections
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from oslo.serialization import jsonutils
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from oslo.utils import timeutils
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from oslo.utils import uuidutils
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from sqlalchemy import Table, Column, String, ForeignKey, DateTime, Enum
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from sqlalchemy import types
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from taskflow.persistence import logbook
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from taskflow import states
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Tables = collections.namedtuple('Tables',
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['logbooks', 'flowdetails', 'atomdetails'])
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# Column length limits...
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NAME_LENGTH = 255
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UUID_LENGTH = 64
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STATE_LENGTH = 255
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VERSION_LENGTH = 64
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class Json(types.TypeDecorator):
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impl = types.Text
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def process_bind_param(self, value, dialect):
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if not value:
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return None
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return jsonutils.dumps(value)
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def process_result_value(self, value, dialect):
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if not value:
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return None
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return jsonutils.loads(value)
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def fetch(metadata):
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"""Returns the master set of table objects (which is also there schema)."""
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logbooks = Table('logbooks', metadata,
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Column('created_at', DateTime,
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default=timeutils.utcnow),
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Column('updated_at', DateTime,
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default=timeutils.utcnow),
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Column('meta', Json),
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Column('name', String(length=NAME_LENGTH)),
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Column('uuid', String(length=UUID_LENGTH),
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primary_key=True, nullable=False, unique=True,
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default=uuidutils.generate_uuid))
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flowdetails = Table('flowdetails', metadata,
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Column('created_at', DateTime,
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default=timeutils.utcnow),
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Column('updated_at', DateTime,
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default=timeutils.utcnow),
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Column('parent_uuid', String(length=UUID_LENGTH),
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ForeignKey('logbooks.uuid',
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ondelete='CASCADE')),
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Column('meta', Json),
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Column('name', String(length=NAME_LENGTH)),
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Column('state', String(length=STATE_LENGTH)),
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Column('uuid', String(length=UUID_LENGTH),
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primary_key=True, nullable=False, unique=True,
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default=uuidutils.generate_uuid))
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atomdetails = Table('atomdetails', metadata,
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Column('created_at', DateTime,
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default=timeutils.utcnow),
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Column('updated_at', DateTime,
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default=timeutils.utcnow),
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Column('meta', Json),
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Column('parent_uuid', String(length=UUID_LENGTH),
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ForeignKey('flowdetails.uuid',
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ondelete='CASCADE')),
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Column('name', String(length=NAME_LENGTH)),
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Column('version', String(length=VERSION_LENGTH)),
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Column('state', String(length=STATE_LENGTH)),
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Column('uuid', String(length=UUID_LENGTH),
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primary_key=True, nullable=False, unique=True,
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default=uuidutils.generate_uuid),
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Column('failure', Json),
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Column('results', Json),
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Column('atom_type', Enum(*logbook.ATOM_TYPES,
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name='atom_types')),
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Column('intention', Enum(*states.INTENTIONS,
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name='intentions')))
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return Tables(logbooks, flowdetails, atomdetails)
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